Ring video doorbells that work perfectly during the day but crash or go offline at night typically suffer from insufficient power delivery. The infrared (IR) night vision LEDs draw significantly more current than daytime operation, causing an undersized or aging transformer to voltage sag below the operational threshold. This triggers CPU crashes and reboot loops exactly when IR lighting activates at sunset.
Quick answer
• Root cause: 10VA transformer can handle day loads but fails under IR night vision power draw • Primary fix: Upgrade doorbell transformer to 16V 30VA rated unit • Quick test: Disable Color Night Vision temporarily — if device stays online, confirms power issue • Applies to: Ring Video Doorbell Wired, Pro, Pro 2, and battery models on hardwired trickle charge
Symptoms
• Doorbell works perfectly from 8 AM to 7 PM
• Video freezes or goes offline exactly at sunset
• Missing recordings between sunset and sunrise
• Random chime dings at night (reboot loop behavior)
• Device Health shows "Good" voltage during day but "Poor" at night
• IR LEDs flicker or don't illuminate consistently
Quick checks
Check transformer voltage under load: Open Ring app → Device Health → Transformer Voltage. Note the reading, then check again after sunset when IR activates. Voltage dropping from "Good" to "Poor" confirms transformer failure under load.
Test IR power draw: Go to Device Settings → Video Settings → Color Night Vision and toggle OFF. If device stays online through the night, this confirms insufficient power delivery for IR operation.
Locate current transformer: Find your doorbell transformer (typically in attic, garage, or basement near electrical panel). Check the rating stamp — standard builder-grade units show "16V 10VA" which is insufficient for IR loads.
Step-by-step fix
- Turn off power at the circuit breaker feeding your doorbell transformer
- Locate the existing transformer — usually mounted near your electrical panel or in utility areas
- Note the wiring configuration before disconnecting — typically two low-voltage wires to doorbell, two high-voltage from house power
- Remove the old transformer by unscrewing mounting bracket and disconnecting wires
- Install 16V 30VA replacement transformer in same location using identical wire connections
- Restore power at the circuit breaker
- Test voltage in Ring app → Device Health — should read stable "Good" rating
- Verify night operation by covering the camera lens to trigger IR activation, or wait until sunset
- Re-enable Color Night Vision in Device Settings → Video Settings if previously disabled
If it still isn't working
Try 24V 40VA transformer: Some installations with long wire runs need higher voltage to compensate for voltage drop over distance.
Check for resistor bypass: If you removed a mechanical chime, ensure proper resistor or jumper installation. Without it, the IR power surge creates short-circuit conditions.
Use plug-in adapter solution: If transformer location is inaccessible, abandon hardwired power. Purchase Ring Plug-In Adapter, drill small hole through door frame, and connect to standard indoor outlet for guaranteed stable 24/7 power.
Measure actual wire run: Calculate total wire length from transformer to doorbell. Runs over 80 feet may need 18-gauge wire upgrade or higher voltage transformer.
FAQ
Q: Can I use a 12V transformer if it's higher wattage? A: No. Ring video doorbells require 16-24V AC minimum. 12V is insufficient regardless of wattage rating and will cause operational failures.
Q: Will a 30VA transformer work with my existing chime? A: Yes. The VA (volt-amp) rating only affects power delivery capacity. Voltage remains 16V AC which is compatible with standard mechanical chimes.
Q: Why does voltage show "Good" during the day if transformer is failing? A: Daytime operation uses minimal power for basic video processing. IR LEDs triple the current draw, exposing transformer inadequacy only under full load conditions.
Q: Is 24V 40VA overkill for a single doorbell? A: It's oversized but completely safe. Higher capacity transformers provide more stable voltage under varying loads and future-proof for additional Ring devices.